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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81094f7e447fed80c4ed8ca7d60a7e5aaf4f16a0c93b0236de489e9b824415f9' 
  AND token = 'slROX2x2CEljbZXhgtnFy79947gKTcXxBb02tC5I9os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}